7220 Datasheet, PDF (252/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
6.7 Control registers
I²C Data Shift Register
b7 b6 b5 b4 b3 b2 b1 b0
I²C data shift register (S0) [Address 00D716]
B Name
Functions
After reset R W
0 _{D0 to D7}
to
7
This is an 8-bit shift register to store
receive data and write transmit data.
Indeterminate R W
Note: To write data into the I²C data shift register after setting the MST bit to
“0” (slave mode), keep an interval of 8 machine cycles or more.
Fig. 6.7.7 I²C data shift register
Address 00D716
I²C Address Register
b7 b6 b5 b4 b3 b2 b1 b0
I²C address register (S0D) [Address 00D816]
B
Name
0 Read/write bit
(RBW)
1 _{Slave address}
to _{(SAD0 to SAD6)}
7
Functions
After reset R W
0: Read
1: Write
0 RW
The address data transmitted from
the master is compared with the
contents of these bits.
0 RW
Fig. 6.7.8 I²C address register
Address 00D816
7220 Group User’s Manual
6-33